Hit-me tools

Abstract

To provide improvement related to arrangement of a motor and a flywheel in a driving tool.SOLUTION: A driving tool includes a tool body, a motor, a flywheel, and a driver. The motor is supported by the tool body. The motor has a stator, a rotor, and an output shaft. The flywheel is operably connected to the output shaft and configured to be rotationally driven around a first axis by the output shaft. At least a part of the flywheel is disposed around at least a part of the motor at the radial outer side of the motor. The output shaft is supported by a motor bearing. The flywheel is supported by a flywheel bearing, which is supported by the tool body separately from the motor bearing, so as to be rotatable around the first axis relative to the tool body.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a driving tool for driving a driving material into a workpiece by a driver.

Background Art

[0002] Generally, a flywheel type driving tool includes a motor, a flywheel, and a driver. The flywheel is rotationally driven by the motor and accumulates rotational energy. The driver linearly moves by the rotational energy transmitted from the flywheel, strikes a driving material such as a nail, and drives it into the workpiece. The arrangements of the motor and the flywheel in the driving tool are various. For example, in the driving tool disclosed in Patent Document 1, the motor and the flywheel are coaxially arranged.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above driving tool, the flywheel is formed in a cup shape and is supported in a cantilever shape by the rotor shaft of the inner rotor of the motor. In such an arrangement, the load applied to the flywheel may have an adverse effect on the rotor shaft.

[0005] In view of the above situation, one non-limiting object of the present disclosure is to provide an improvement in the arrangement of the motor and the flywheel in the driving tool.

Means for Solving the Problems

[0006] According to one non-limiting aspect of the present disclosure, a driving tool is provided configured to drive a driving material into a workpiece. The driving tool comprises a tool body, a motor, a flywheel, and a driver. The motor is supported by the tool body. The motor has a stator, a rotor, and an output shaft rotatable integrally with the rotor about a first axis. The flywheel is operably coupled to the output shaft and configured to be rotationally driven by the output shaft about the first axis. The driver is positioned opposite the outer circumference of the flywheel. The driver is configured to drive the driving material into the workpiece by moving linearly in response to frictional engagement with the flywheel.

[0007] At least a portion of the flywheel is positioned radially outward from the motor and around at least a portion of the motor. The output shaft is supported by motor bearings. The flywheel is supported by flywheel bearings, which are supported separately from the motor bearings and are located on the tool body.

[0008] In this embodiment of the driving tool, at least a portion of the flywheel is positioned radially outward from the motor and around at least a portion of the motor. That is, in the direction of extension of the first shaft, the area occupied by the flywheel and the area occupied by the motor overlap at least partially. Therefore, the overall dimensions of the area occupied by the motor and flywheel can be reduced, and the driving tool can be made smaller. Furthermore, the flywheel is supported by a flywheel bearing supported on the tool body separately from the motor bearing. Therefore, the possibility of the motor being affected by the load on the flywheel can be reduced. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram illustrating the overall configuration of a driving tool. [Figure 2] This is a cross-sectional view along line II-II in Figure 1. [Modes for carrying out the invention]

[0010] In a non-limiting embodiment of this disclosure, the driver may include a first friction engagement portion. The outer circumference of the flywheel may include a second friction engagement portion that can frictionally engage with the first friction engagement portion of the driver. The driver, the flywheel, and the flywheel bearing may be arranged such that a plane perpendicular to the first axis passes through the first friction engagement portion, the second friction engagement portion, and the flywheel bearing. According to this embodiment, the flywheel bearing can reliably receive the load applied to the flywheel (a load in the direction toward the first axis) when the flywheel and the driver are frictionally engaged. Therefore, tilting of the flywheel with respect to the first axis can be effectively suppressed.

[0011] Furthermore, in this embodiment, the driver, flywheel, and motor bearing may be arranged such that the plane perpendicular to the first shaft passes through the first friction engagement portion, the second friction engagement portion, and the motor bearing. In other words, the flywheel bearing and the motor bearing may be positioned at substantially the same location in the extending direction of the first shaft and substantially aligned in the radial direction of the output shaft. In this case, the dimensions of the flywheel in the extending direction of the first shaft can be shortened compared to the case where the flywheel bearing and the motor bearing are positioned at separate locations in the extending direction of the first shaft.

[0012] In addition to, or in place of, the above embodiments, the motor bearing and the flywheel bearing may be supported by a single member. The single member may be, for example, one of several members that are substantially immovably connected to each other and constitute the tool body. According to this embodiment, dimensional errors and assembly errors are reduced compared to the case in which the motor bearing and the flywheel bearing are supported by separate members, thereby reducing the positional error between the motor bearing and the flywheel bearing. This improves the positional accuracy of the motor and flywheel.

[0013] In addition to the above embodiments, or as an alternative to the above embodiments, the flywheel and the motor output shaft may be connected (engaged) to each other in a manner that allows for rotational transmission with some play. According to this embodiment, rotational transmission is possible even if the axis of the flywheel and the axis of the output shaft are slightly misaligned. Also, connection (engagement) of the flywheel and the output shaft becomes easier. Furthermore, in this embodiment, the flywheel and the output shaft may be spline-fitted. Spline fitting can transmit a larger torque than, for example, connection by key and keyway.

[0014] In addition to the above embodiment, or in place of the above embodiment, the friction engagement region in which the flywheel and driver frictionally engage, the stator, and the rotor may be located on the same side in the extending direction of the first shaft with respect to the rotational transmission region in which the flywheel and the output shaft are rotationally connected (engaged). According to this embodiment, the overlap between the region occupied by the flywheel and the region occupied by the motor in the extending direction of the first shaft can be increased, and the overall size of the region occupied by the motor and flywheel can be reduced. Therefore, the driving tool can be more reliably miniaturized.

[0015] Hereinafter, with reference to the drawings, a driving tool 1 according to a representative and non-limiting embodiment of this disclosure will be specifically described.

[0016] First, with reference to Figure 1, the general configuration of the driving tool 1 will be described.

[0017] The driving tool 1 is a tool that uses a driver 4 that moves in a straight line to drive a driving material 9 into a workpiece. The driving tool 1 can be embodied as, for example, a nail gun, a tacker, or a staple gun. Depending on the type of driving tool 1, the driving material 9 can be, for example, nails, rivets, pins, or staples.

[0018] The outer casing of the driving tool 1 is mainly formed from the main body housing 11, the nose section 12, the handle 14, and the magazine 17.

[0019] The main housing 11 houses the motor 2, flywheel 3, driver 4, etc. The flywheel 3 is rotationally driven by the motor 2 and stores rotational energy. The driver 4 is positioned opposite the outer circumference of the flywheel 3. As the driver 4 frictionally engages with the flywheel 3, it moves linearly along the drive shaft DX by the rotational energy transmitted from the flywheel 3, driving the driving material 9 into the workpiece.

[0020] The nose section 12 is connected to one end of the main body housing 11 in the direction of extension of the drive shaft DX (hereinafter also simply referred to as the drive shaft direction). The nose section 12 has an opening (exhaust port 120) at the end opposite to the side connected to the main body housing 11. A driver passage is defined within the main body housing 11 and the nose section 12. The driver passage extends along the drive shaft DX to the exhaust port 120.

[0021] Furthermore, a contact arm 13 is positioned on the nose section 12. The tip of the contact arm 13 is positioned near the injection port 120. A contact arm switch (not shown) is located inside the main body housing 11. The contact arm switch is normally kept in the off state. The contact arm switch is configured to be turned on when the contact arm 13 is pressed against the workpiece by the user.

[0022] The handle 14 protrudes from the main body housing 11 in a direction intersecting the drive shaft DX. At the base end portion of the handle 14 (the end portion connected to the main body housing 11), a trigger 140 configured to enable a pressing operation by the user is provided. Inside the handle 14, a trigger switch 141 is disposed. The trigger switch 141 is configured to be maintained in an off state at all times and to be turned on in response to a pressing operation of the trigger 140. Further, at the tip end portion of the handle 14 (the end portion opposite to the base end portion), a battery mounting portion 15 having terminals and the like is provided. A rechargeable battery 19 that supplies power to the motor 2 and the like is removably mounted on the battery mounting portion 15.

[0023] The magazine 17 is configured to be filled with a plurality of driving materials 9 and is mounted on the nose portion 12. The driving materials 9 filled in the magazine 17 are supplied one by one onto the driver passage by a nail feeding mechanism (not shown).

[0024] Hereinafter, the detailed configuration of the driving tool 1 will be described. In the following description, for the sake of convenience, the drive shaft direction (the left - right direction in FIG. 1) is defined as the front - rear direction of the driving tool 1, the side where the ejection port 120 is provided (the right side in FIG. 1) is defined as the front side of the driving tool 1, and the opposite side (the left side in FIG. 1) is defined as the rear side. Further, the direction orthogonal to the drive shaft DX and corresponding to the extending direction of the handle 14 (the up - down direction in FIG. 1) is defined as the up - down direction of the driving tool 1, the base end portion side of the handle 14 (the upper side in FIG. 1) is defined as the upper side, and the tip end portion side of the handle 14 (the lower side in FIG. 1) is defined as the lower side. Also, the direction orthogonal to the front - rear direction and the up - down direction is defined as the left - right direction.

[0025] First, the elements arranged inside the main body housing 11 will be described.

[0026] As shown in FIGS. 1 and 2, inside the main body housing 11, a tool body 10 (not shown in FIG. 1), a motor 2, a flywheel 3, a driver 4, a driver operating mechanism 51, a pressing mechanism 53, and a return mechanism (not shown) are arranged.

[0027] The tool body 10, also referred to as the frame or support, is fixedly held in the main body housing 11. The tool body 10 supports at least the motor 2 and the flywheel 3. The tool body 10 in this embodiment includes a plurality of members that are connected and fixed to each other. More specifically, the tool body 10 is formed by a first member 101 and a second member 102 being substantially immovably connected to each other. Both the first member 101 and the second member 102 are made of metal (for example, iron, aluminum, or an alloy of iron or aluminum).

[0028] In this embodiment, the first member 101 and the second member 102 correspond to the left and right portions of the tool body 10, respectively. However, the tool body 10 may be constructed by connecting and fixing multiple members that are divided in different directions. Also, at least a part of the tool body 10 may be made of a material other than metal.

[0029] Motor 2 is supported by the tool body 10 within the lower part of the main housing 11. The rotation axis RX of motor 2 extends in a direction perpendicular to the drive axis DX (specifically, in the left-right direction). In this embodiment, motor 2 is energized and driven when either the contact arm switch or the trigger switch 141 is turned ON. The flywheel 3 is arranged coaxially with motor 2 and supported by the tool body 10. The flywheel 3 is rotationally driven by motor 2 around the rotation axis RX and stores rotational energy. The detailed configuration and arrangement of motor 2 and flywheel 3 will be described later.

[0030] The driver 4 is an elongated member that extends in the drive axis direction (front-rear direction). The driver 4 includes a main body 41, a roller contact portion 43 that protrudes upward from the main body 41, and a first friction engagement portion 45 that protrudes downward from the main body 41. The front end of the main body 41 constitutes a striking portion that strikes the driving material 9. The roller contact portion 43 is the part that receives pressure from the pressing roller 531, which will be described later. The front end of the roller contact portion 43 is configured as a cam portion whose height (thickness in the vertical direction) gradually increases toward the rear. The first friction engagement portion 45 is configured to frictionally engage with the flywheel 3 (specifically, the second friction engagement portion 33). The first friction engagement portion 45 in this embodiment includes a plurality of engagement projections 451. Each engagement projection 451 is a ridge that extends in the front-rear direction.

[0031] The driver 4 is positioned above the flywheel 3 and faces the outer circumference of the flywheel 3. The driver 4 is movable in the longitudinal direction between an initial position (the position shown in Figure 1) and an injection position (not shown) in which the front end of the driver 4 protrudes slightly from the nozzle 120. The driver 4 is normally held in the initial position (rearmost position). When the driver 4 is in the initial position, the driver 4 and the flywheel 3 do not engage with each other by friction.

[0032] The driver operating mechanism 51 is supported by the tool body 10 above the driver 4. The driver operating mechanism 51 is configured to move the driver 4 forward to a position where rotational energy can be transmitted from the flywheel 3. The driver operating mechanism 51 in this embodiment includes a solenoid 511 and a lever 513. The lever 513 rotates in response to the activation of the solenoid 511, pushing the driver 4 forward and thereby moving the driver 4 forward. In this embodiment, the solenoid 511 is activated in response to both the contact arm switch and the trigger switch 141 being turned on. That is, the solenoid 511 is activated when the motor 2 is running.

[0033] The pressing mechanism 53 is located within the main housing 11, above the driver 4, and faces the driver 4 on the opposite side from the flywheel 3. The pressing mechanism 53 includes a pressing roller 531 and a biasing spring 533. The pressing roller 531 is supported so as to be movable in the vertical direction and rotatable about an axis parallel to the rotation axis RX of the flywheel 3. The biasing spring 533 biases the pressing roller 531 downward. The pressing roller 531 contacts the roller contact portion 43 as the driver 4 is moved forward from its initial position by the driver operating mechanism 51. The pressing roller 531 presses the driver 4 toward the flywheel 3, causing the driver 4 to frictionally engage with the flywheel 3. As a result, the driver 4 receives rotational energy transmitted from the flywheel 3 and moves linearly forward to the driving position, driving the driving material 9 into the workpiece.

[0034] Alternatively, instead of the driver operating mechanism 51 and pressing mechanism 53 described above, a known pressing mechanism may be used that presses the driver 4 in its initial position downward with a pressing roller and frictionally engages it with the flywheel 3. The configuration of the driver 4 may also be modified accordingly.

[0035] The return mechanism is configured to return the driver 4 to its initial position after the driving material 9 has been driven out. As the return mechanism, for example, a known mechanism can be used that is configured to pull the driver 4, which has been moved forward to the driving position, back to its initial rear position by the elastic force of an elastic member (for example, a compression coil spring or a torsion coil spring).

[0036] The detailed configuration and arrangement of motor 2 and flywheel 3 will be described below.

[0037] As shown in Figure 2, the motor 2 includes a stator 21, a rotor 23, and an output shaft 25 that can rotate integrally with the rotor 23. The motor 2 in this embodiment is an inner-rotor type brushless DC motor, and the rotor 23 is located radially inside the stator 21. The axial ends of the output shaft 25 protrude from the axial ends of the rotor 23. The rotation axis RX of the output shaft 25 extends in the left-right direction. The stator 21 and rotor 23 of the motor 2 are positioned on one side (right side) of a virtual plane (a virtual plane perpendicular to the rotation axis RX and including the drive axis DX) that is perpendicular to the rotation axis RX and passes through the substantial left-right center of the driving tool 1.

[0038] The stator 21 is housed in a motor case 20 and supported by the tool body 10. The motor case 20 is a bottomed cylindrical member having a cylindrical wall portion 201 and a bottom wall portion 203. The motor case 20 is substantially immovably fixed to the tool body 10. More specifically, the motor case 20 is positioned with an opening to the left and the bottom wall portion 203 on the right side, and is fixed to a second member 102 of the tool body 10 with screws (not shown).

[0039] The output shaft 25 is supported by a first motor bearing 261 and a second motor bearing 262 so as to be rotatable around the rotation axis RX relative to the tool body 10. In this embodiment, the first motor bearing 261 is supported by the tool body 10. More specifically, the first motor bearing 261 is fitted and supported inside a cylindrical portion (hereinafter referred to as the cylindrical portion 103) of the second member 102. On the other hand, the second motor bearing 262 is supported by a motor case 20 fixed to the second member 102. More specifically, the second motor bearing 262 is fitted and supported in a recess provided in the center of the bottom wall portion 203 of the motor case 20.

[0040] Furthermore, a first rotation transmission section 27 is provided on the portion of the output shaft 25 that protrudes to the left from the rotor 23. More specifically, the first rotation transmission section 27 is provided on the portion that protrudes to the left of the first motor bearing 261. The first rotation transmission section 27 is configured to engage with the second rotation transmission section 35 of the flywheel 3 and transmit the rotation of the output shaft 25 to the flywheel 3. In this embodiment, the first rotation transmission section 27 is configured as an external spline section with splines (teeth, ridges) 271 formed on its outer circumference.

[0041] The flywheel 3 is formed in a cup shape overall. More specifically, the flywheel 3 includes a cylindrical large-diameter portion 311 and a cylindrical small-diameter portion 313 having smaller inner and outer diameters than the large-diameter portion 311. The flywheel 3 is oriented with the large-diameter portion 311 on the right and the small-diameter portion 313 on the left, and is rotatably supported around the rotation axis RX relative to the tool body 10 by a first flywheel bearing 371. The first flywheel bearing 371 is fitted and supported around the cylindrical portion 103 of the second member 102.

[0042] The large-diameter portion 311 is fitted onto the outer circumference of the first flywheel bearing 371 and is rotatably supported. In other words, the large-diameter portion 311 is positioned around a part of the output shaft 25, the first motor bearing 261, the cylindrical portion 103, and the first flywheel bearing 371 on the radially outer side of these components.

[0043] Furthermore, a second friction engagement portion 33 is provided on the outer circumference of the large-diameter portion 311. The second friction engagement portion 33 is configured to frictionally engage with the first friction engagement portion 45 of the driver 4. The second friction engagement portion 33 in this embodiment includes a plurality of engagement grooves 331 corresponding to a plurality of engagement protrusions 451 of the first friction engagement portion 45. Each engagement groove 331 is an annular groove that surrounds the entire circumference of the flywheel 3. The engagement grooves 331 are configured to at least partially contact the engagement protrusions 451 when the driver 4 is pressed against the flywheel 3, and to engage with the engagement protrusions 451 by frictional force.

[0044] The small-diameter portion 313 is arranged around the first rotational transmission portion 27 of the output shaft 25 of the motor 2. The small-diameter portion 313 is provided with a second rotational transmission portion 35. The second rotational transmission portion 35 is connected (engaged) with the first rotational transmission portion 27 of the output shaft 25 and is configured to rotate together with the output shaft 25. In this embodiment, the second rotational transmission portion 35 is configured as an internal spline portion with splines (teeth, ridges) 351 formed on its inner circumference.

[0045] The first rotational transmission section 27 (spline 271) and the second rotational transmission section 35 (spline 351) are connected (engaged) with some play. In other words, the output shaft 25 and the flywheel 3 are spline-fitted with some play. With this configuration, rotational transmission is possible even if the axis of the flywheel 3 and the axis of the output shaft 25 are slightly misaligned. Furthermore, since high-precision dimensional control is not required for the first rotational transmission section 27 and the second rotational transmission section 35, manufacturing is easy, and connection (engagement) between the flywheel 3 and the output shaft 25 is also easy. In addition, spline fitting has the advantage of being able to transmit a larger torque compared to connections using, for example, keys and keyways.

[0046] Furthermore, in the extending direction of the rotation axis RX (i.e., left-right direction), the region in which the first rotation transmission unit 27 and the second rotation transmission unit 35 engage in a rotationally transmittable manner (rotation transmission region R4) is located at a position corresponding to the tip of the output shaft 25. The region in which the second friction engagement unit 33 and the first friction engagement unit 45 engage (friction engagement region R3), the stator 21, and the rotor 23 are located on the same side (right side) relative to the rotation transmission region R4 in the extending direction of the rotation axis RX (hereinafter referred to as the rotation axis direction).

[0047] Furthermore, a second flywheel bearing 372 is fitted around the tip of the small-diameter portion 313 (more specifically, the portion that protrudes to the left of the left end of the first rotation transmission portion 27). The second flywheel bearing 372 is fitted and supported in a recess provided in the first member 101 of the tool body 10. In this embodiment, the first flywheel bearing 371 is designed to be able to withstand the load of the flywheel 3 on its own. On the other hand, the second flywheel bearing 372 is added, for example, to prevent the flywheel 3 from coming off the first member 101 during assembly and to provide auxiliary support for the flywheel 3. Therefore, the second flywheel bearing 372 may be omitted.

[0048] As described above, a portion of the flywheel 3 in this embodiment surrounds a portion of the motor 2 on its radially outer side. In other words, a portion of the flywheel 3 is positioned to overlap with a portion of the motor 2 in the direction of rotation. More specifically, in the direction of rotation (left-right direction), the flywheel region R1 between the ends of the flywheel 3 (left and right ends) partially overlaps with the motor region R2 between the ends of the motor 2 (left and right ends). More specifically, the motor 2 and the flywheel 3 are positioned such that a portion of the flywheel region R1 overlaps with the portion of the motor region R2 between the left end of the stator 21 and rotor 23 and the tip (left end) of the output shaft 25. That is, a portion of the flywheel 3 surrounds the portion of the output shaft 25 that protrudes to the left from the stator 21 and rotor 23. This arrangement makes it possible to realize a compact driving tool 1.

[0049] Specifically, compared to a configuration where the motor 2 and flywheel 3 are arranged side by side in the front-to-back direction, the dimensions of the driving tool 1 in the front-to-back direction can be reduced. Furthermore, the mechanism for transmitting rotation from the output shaft 25 to the flywheel 3 can be simplified. Also, compared to a configuration where the motor 2 and flywheel 3 are arranged side by side (without overlapping) in the left-to-right direction, the dimensions of the driving tool 1 in the left-to-right direction can be reduced. In particular, in this embodiment, most of the flywheel 3 is arranged around the motor 2. Specifically, of the flywheel region R1 described above, the area that overlaps with the motor region R2 is more than three-quarters of the flywheel region R1. Therefore, the dimensions of the driving tool 1 in the left-to-right direction can be reliably reduced. Furthermore, the entire flywheel 3 is arranged around the part of the motor 2 other than the stator 21 which has the largest diameter. Therefore, the radial dimensions can be reduced compared to the case where at least a part of the flywheel 3 is arranged around the stator 21.

[0050] Furthermore, the flywheel 3 is supported not by the output shaft 25, but by a first flywheel bearing 371 supported by the tool body 10. Therefore, the output shaft 25 does not directly bear the load on the flywheel 3. This improves the durability of the motor 2.

[0051] Furthermore, in the driving tool 1, the driver 4 needs to be pressed against the flywheel 3 and frictionally engage with the flywheel 3 in order to perform the driving action. In this configuration, a strong load is applied to the flywheel 3 in the direction toward the rotation axis RX (downward) from the second friction engagement part 33 which frictionally engages with the first friction engagement part 45.

[0052] In contrast, in this embodiment, the driver 4, the flywheel 3, and the first flywheel bearing 371 are arranged such that a virtual plane (for example, plane L in Figure 2) perpendicular to the rotation axis RX passes through the first friction engagement portion 45, the second friction engagement portion 33, and the first flywheel bearing 371. Therefore, the load applied from the driver 4 to the flywheel 3 can be reliably received by the first flywheel bearing 371 supported by the tool body 10. As a result, tilting of the flywheel 3 with respect to the rotation axis RX is suppressed. This reduces the possibility of transmission failure from the output shaft 25 to the flywheel 3.

[0053] Furthermore, the first motor bearing 261 is positioned such that the aforementioned plane L, which passes through the first friction engagement portion 45, the second friction engagement portion 33, and the first flywheel bearing 371, also passes through the first motor bearing 261. In other words, the first flywheel bearing 371 and the first motor bearing 261 are positioned at approximately the same location in the rotation axis direction (at least partially overlapping with the friction engagement region R3) and are substantially aligned radially with the output shaft 25. Therefore, the dimensions of the flywheel 3 in the rotation axis direction can be shortened compared to the case where the first flywheel bearing 371 and the first motor bearing 261 are positioned at separate locations in the rotation axis direction.

[0054] Furthermore, the first motor bearing 261 and the first flywheel bearing 371 are supported by the second member 102, which is a single member among the multiple members (first member 101 and second member 102) that make up the tool body 10. Therefore, dimensional errors and assembly errors can be reduced compared to the case where the first motor bearing 261 and the first flywheel bearing 371 are supported by separate members. As a result, the positional error between the first motor bearing 261 and the first flywheel bearing 371 can be reduced, thereby improving the positional accuracy of the motor 2 and the flywheel 3.

[0055] The correspondence between each component (feature) of the above embodiments and each component (feature) of the present disclosure or invention is shown below. However, each component of the embodiments is merely an example and does not limit each component of the present disclosure or invention.

[0056] The rotation axis RX of the output shaft 25 is an example of a "first axis". The first motor bearing 261 is an example of a "motor bearing". The first flywheel bearing 371 is an example of a "flywheel bearing". Plane L is an example of a "plane perpendicular to the first axis". The second member 102 is an example of a "single member".

[0057] It should be noted that the above embodiments are merely illustrative, and the driving tool according to this disclosure is not limited to the illustrated driving tool 1. For example, modifications as illustrated below can be made. Furthermore, at least one of these modifications may be adopted in combination with the driving tool 1 illustrated in the embodiments and at least one of the features described in each claim.

[0058] For example, the motor 2 may be directly supported on the tool body 10 without being housed in a motor case 20. The motor 2 may be a brush motor or an AC motor. The first motor bearing 261 does not need to be in approximately the same position as the first flywheel bearing 371 in the direction of rotation axis, but as mentioned above, from the viewpoint of the positional accuracy of the motor 2 and flywheel 3, it is preferable that it be supported together with the first flywheel bearing 371 on the same single component.

[0059] The shape of the flywheel 3 and its arrangement relative to the motor 2 can be modified as appropriate, provided that the flywheel 3 is arranged coaxially with the motor 2 and at least a portion of the flywheel 3 is positioned radially outward from the motor 2 and around at least a portion of the motor 2. For example, at least a portion of the flywheel 3 may be positioned around the entire motor 2. In other words, a portion of the flywheel 3 may surround the stator 21. The position of the first flywheel bearing 371 can also be changed in accordance with such modifications. For example, if a portion of the flywheel 3 surrounds the stator 21, the tool body 10 may be provided with a cylindrical portion that surrounds the stator 21, and the first flywheel bearing 371 may be fitted around this cylindrical portion.

[0060] Furthermore, the configuration of the first friction engagement portion 45 of the driver 4 and the second friction engagement portion 33 of the flywheel 3 can be modified as appropriate, insofar as the first friction engagement portion 45 and the second friction engagement portion 33 can frictionally engage with each other to transmit the rotational energy of the flywheel 3 to the driver 4. For example, the number and arrangement of the engagement projections 451 and engagement grooves 331 can be selected as appropriate. Alternatively, for example, the driver 4 may have engagement grooves and the flywheel 3 may have engagement projections.

[0061] In view of the spirit of the present invention and the embodiments described above, the following embodiments are constructed. At least one of the following embodiments may be adopted in combination with the features of the embodiments and their modifications, or at least one of the features described in each claim. [Aspect 1] The output shaft is rotatably supported by two bearings, and the motor bearing is one of the two bearings. [Aspect 2] The tool body has a cylindrical portion that surrounds a part of the motor, The flywheel bearing is fitted and supported around the cylindrical portion. A portion of the flywheel is fitted around the flywheel bearing and rotatably supported. [Aspect 3] The driving tool further comprises a pressing roller configured to press the driver toward the flywheel. [Aspect 4] The pressing roller, the driver, the flywheel, and the flywheel bearing are arranged such that a straight line perpendicular to the first axis passes through the pressing roller, the first friction engagement portion, the second friction engagement portion, and the flywheel bearing. [Aspect 5] The flywheel is positioned entirely around the portion of the motor other than the stator. [Explanation of Symbols]

[0062] 1: Driving tool, 10: Tool body, 101: First component, 102: Second component, 103: Cylindrical section, 11: Main housing, 12: Nose section, 120: Outlet, 13: Contact arm, 14: Handle, 140: Trigger, 141: Trigger switch, 15: Battery mounting section, 17: Magazine, 19: Battery, 2: Motor, 20: Motor case, 201: Cylinder wall section, 203: Bottom wall section, 21: Stator, 23: Rotor, 25: Output shaft, 261: First motor bearing, 262: Second motor bearing, 27: First rotation transmission section, 271: Spline, 3: Flywheel, 3 11: Large diameter section, 313: Small diameter section, 33: Second friction engagement section, 331: Engagement groove, 35: Second rotational transmission section, 351: Spline, 371: First flywheel bearing, 372: Second flywheel bearing, 4: Driver, 41: Main body section, 43: Roller contact section, 45: First friction engagement section, 451: Engagement projection, 51: Driver operating mechanism, 511: Solenoid, 513: Lever, 53: Pressing mechanism, 531: Pressing roller, 533: Biasing spring, 9: Insert material, R1: Flywheel area, R2: Motor area, R3: Friction engagement area, R4: Rotational transmission area, DX: Drive shaft, RX: Rotation shaft

Claims

1. A driving tool configured to drive a driving material into a workpiece, The tool body and A motor supported by the tool body, comprising a stator, a rotor, and an output shaft extending from the inside to the outside of the rotor and rotatable integrally with the rotor around a first axis, A flywheel is operably connected to the output shaft and configured to be rotationally driven by the output shaft around the first axis, The system includes a driver positioned opposite the outer circumference of the flywheel and configured to drive the driving material into the workpiece by moving linearly in response to frictional engagement with the flywheel, At least a portion of the flywheel is positioned radially outward of the motor and around at least a portion of the motor, The output shaft is supported by the tool body by at least one motor bearing located outside the motor. The driving tool is characterized in that the flywheel is supported by at least one flywheel bearing, which is supported on the tool body separately from the motor bearing, so as to be rotatable around the first axis relative to the tool body.

2. A driving tool according to claim 1, The driver comprises a first friction engagement portion, The outer circumference of the flywheel is provided with a second friction engagement portion that can frictionally engage with the first friction engagement portion of the driver, A driving tool characterized in that the driver, the flywheel, and the flywheel bearing are arranged such that a plane perpendicular to the first shaft passes through the first friction engagement portion, the second friction engagement portion, and the flywheel bearing.

3. The driving tool according to claim 2, A driving tool characterized in that the driver, the flywheel, and the motor bearing are arranged such that the plane passes through the first friction engagement portion, the second friction engagement portion, and the motor bearing.

4. A driving tool according to any one of claims 1 to 3, A driving tool characterized in that the motor bearing and the flywheel bearing are supported by a single member.

5. A driving tool according to claim 1, A driving tool characterized in that the flywheel and the output shaft of the motor are connected to each other in a manner that allows rotational transmission with radial play.

6. The driving tool according to claim 5, A driving tool characterized in that the flywheel and the output shaft are spline-fitted.

7. A driving tool according to claim 5 or 6, A driving tool characterized in that the friction engagement region in which the flywheel and the driver frictionally engage, the stator and the rotor are located on the same side with respect to the rotational transmission region in which the flywheel and the output shaft are rotatably connected, in the extending direction of the first shaft.

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